Stargate fans will converge on the Windy City this weekend for a Stargate convention – Aug. 19-21 at the Westin O’Hare – featuring cast from Stargate Universe, Stargate Atlantis and Stargate SG-1. The convention will feature photo and autograph opportunities, as well as an acting workshop with Alexis Cruz and a breakfast with Ben Browder. There will also be a karaoke party on Friday night.